Nothing that I've been able to see so far, but they were most likely behind the Poison-types swarming the cities in May, and the mutations that happened afterwards, so the possibility is there.
[Though it's worth noting that most likely doesn't mean confirmed. She doesn't have the intel she needs to say that. Not yet.]
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[Though it's worth noting that most likely doesn't mean confirmed. She doesn't have the intel she needs to say that. Not yet.]